Step-by-step explanation:
The forumla of percentage is Part over Whole
V = -5 because you subtract 4 from both sides then divide both sides by -7 and you get -5
If you're using a few larger intervals, then your histogram looks more stocky. If you imagine drawing one, it's because you're adding more values into the same category which can make the difference between two intervals much more noticeable. If you're using smaller intervals, however, you can much more accurately assess the difference between two different intervals. For that reason, the transition between one and another interval would look much more 'fluid'.
